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中间体自由基
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  intermediate free radical
     In the supporting electrolyte of 0.08 mol/L HAc-NaAc(pH=4.2),ibuprofen produced a catalytic wave at(-1.06) V.When oxidant K_2S_2O_8 was present,a polarographic catalytic wave was produced because K_2S_2O_8 oxidized the intermediate free radical to regenerate the original c=o group.
     在0.08mol/L HAc-NaAc(pH=4.2)支持电解质中,布洛芬于-1.06 V处产生一极谱波,当氧化剂K2S2O8存在时,K2S2O8氧化布洛芬羰基还原中间体自由基,使布洛芬再生,产生布洛芬的极谱催化波。
短句来源
     As for the parallel catalytic wave, it is attributed to the fact that the intermediate free radical produced during the reduction process of organic compounds is oxidized by oxidant to regenerate the original.
     平行催化波是指存在氧化剂时,有机化合物还原中间体自由基自身被氧化为原电活性物质,再生原还原基团。 可见,两种类型催化波具有完全不同的产生机理。
短句来源
     The process of reduction was the two step transmission process of electric charge with the intermediate free radical.
     结论:证实MPA的还原过程有中间体自由基参与。
短句来源
     The dimer could be oxidized at -1 17 V ( vs SCE). When oxidant H 2O 2 was present, both the further reduction and dimerization were interrupted, and a polarographic catalytic wave was produced because H 2O 2 oxidized the intermediate free radical to regenerate the original CO group. Based on the polarographic catalytic wave, a new method for the determination of hesperidin was proposed.
     当氧化剂H2 O2 存在时 ,H2 O2 氧化橙皮苷羰基还原中间体自由基 ,阻断了该自由基进一步还原和二聚化反应 ,并使橙皮苷再生 ,产生橙皮苷的极谱催化波。
短句来源
  intermediate radical
     In pH 1 0~3 2, Dss showed two reduction waves with the peak potentials at -0 62 V (Pc 1, vs. SCE) and -1 15 V (Pc 2, vs. SCE), respectively. The former was an irreversible adsorptive wave of protonized Dss involving one electron and the latter was also an irreversible adsorptive wave of reduction intermediate radical of Dss involving one electron and one proton.
     研究证实 ,在pH <3 2条件下所获得的Pc1,Pc2 波分别为质子化的Dss的单电子不可逆吸附还原波及还原中间体自由基的单电子单质子不可逆吸附还原波 ;
短句来源
     Between pH 3 2~6 2, Dss showed one reduction wave (Pc 3), which was an irreversible adsorptive wave involving one electron and one proton. Wave of reduction intermediate radical of Dss was overlapped because of a discharge of hydrogen ion into the electrolyte solution.
     在 3 2 中间体自由基的单电子波被氢波掩盖 .
短句来源
  “中间体自由基”译为未确定词的双语例句
     H_2O_2 and its reduction species as oxidant oxidized the interminal radical of chloroquine phosphate enduring 1e~-, 1H~+ reduction and yielded a catalytic wave.
     (2)H2O2作为氧化剂氧化磷酸氯喹经单电子单质子还原生成的中间体自由基,产生极谱催化波。
短句来源
     From the literatures reported, the study on polarographic catalytic wave for inorganic metal ions has made a great progress.
     有机化合物平行催化波是指在氧化剂存在时,有机化合物还原中间体自由基被氧化为原电活性物质,再生原还原基团从而产生自身的极谱催化波。
短句来源
     Oscillation in light absorption caused by photochemical reaction was observed,and the phenomenon was re-demonstrated in the chain reaction system of 1,2—dichloroethane.
     实验中观察到了中间体自由基光吸收的振荡现象,并在1,2—二氯乙烷链式反应中得到重复。
短句来源
     As for the parallel catalytic wave, it is attributed to the regeneration of the electroactive reactant via oxidation reaction of the reduction intermediate product of the reactant.
     平行催化波是指存在氧化剂时,有机化合物还原中间体自由基自身被氧化为原电活性物质,再生原还原基团。
短句来源
     When SiOg2" was present, the free radical of vitamin P was oxidized by both SiO^2 and its reduction intermediate, sulfate radical anion SO4'", to regenerate the original, which resulted into the production of a polarographic catalytic wave of vitamin P. Based on this catalytic wave, a novel method for the determination of vitamin P was proposed.
     当氧化剂K2S2O8存在时,维生素P还原中间体自由基在电极表面上能被K2S2O8及其还原中间体硫酸根阴离子自由基SO4氧化,再生原可还原羰基官能团C=O,从而产生了维生素P的极谱催化波。 基于此,提出了一种测定维生素P的新方法。
短句来源
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  intermediate free radical
The catalytic wave, which is caused by the reduction of organic compound itself and the chemical reaction between oxidant and organic intermediate free radical to regenerate original organic compound, is a new-type wave of organic compound.
      
Kinetic data showed that the reaction involves the formation of an unstable complex and an intermediate free radical.
      
  intermediate radical
The reactions occur in two consecutive steps: first the HO· (RO·, RO2·) radical adds to CO and then the resulting unstable intermediate radical decomposes to evolve CO2.
      
An inhibition mechanism was proposed; it involves the interaction of a hydrophobic nitroxyl radical with the intermediate radical enzyme-substrate complex.
      
The benzaldehyde acts as both a prebase (intermediate radical anion of benzaldehyde deprotonates the chloroform) and an electrophilic agent.
      
One (Rab) is an intermediate radical which is produced by hydrogen abstraction of OH radical from surfactant and effective only on the reduction of Pt(II) to Pt(0).
      
The other (Rpy) is also an intermediate radical which is produced by thermal decomposition of surfactant at the interface between the cavity and bulk solution and effective on the reduction of Pt(IV) to Pt(II).
      
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When the direct addition of thiophenol to phenylacetylene, p-bromophenylacetylene, p-nitrophenylacetylene, and propiolic acid was conducted at room temperature, the corresponding 1:1 adducts of trans-configuration were obtained, which were trans-β-phenylthiostyrene (Ia), trans-β-phenylthio-p-bromostyrene (Ⅱa), and trans-β-phenylthioacrylic acid (Ⅳa) respectively. The yields of these adducts decreased in the following order: Ⅰa>Ⅱa>Ⅲa>Ⅳa.

苯硫酚与苯乙炔、对溴苯乙炔、对硝基苯乙炔及丙炔酸在室温进行直接加成时,生成相应的1:1加成物,其主体构型均属反式,分别为反-β-苯硫基苯乙烯(Ⅰa),反-β-苯硫基对溴苯乙烯(Ⅱa),反-β-苯硫基对硝基苯乙烯(Ⅲa)及反-β-苯硫基丙烯酸(Ⅳa)。加成物的得率按以下顺序而递減:Ⅰa>Ⅱa>Ⅲa>Ⅳa。在低温(-45~-35°)苯硫酚与四种炔烃在溶液中反应时,除对硝基苯乙炔不起反应外,其它三种炔化合物均给出全部或绝大部分顺式构型产物(反式加成),分别为顺-β-苯硫基苯乙烯(Ⅰb,100%),顺-β-苯硫基对溴苯乙烯(Ⅱb,75%)及顺-β-苯硫基丙烯酸(Ⅳb,80%)。所有顺式构型产物在反应条件下都稳定,只是在加热到160°以上时才转化为反式构型产物。苯硫酚对炔烃的直接加成为一自由基反应,所观察到的立体化学结果被解释为加成反应中形成的中间体自由基(Ⅴ),由于R(苯基或羧基)与处于顺式位置的C_6H_5S基的空间位阻,在与苯硫酚进行链转移之前发生异构化所致。因为Ⅴ的异构化为Ⅵ需要一定的活化能,故在低温下的加成全部或绝大部分按反式加成进行,在温度升高时全部转为顺式加成。苯硫酚与对硝基苯乙炔在无水乙醚中...

苯硫酚与苯乙炔、对溴苯乙炔、对硝基苯乙炔及丙炔酸在室温进行直接加成时,生成相应的1:1加成物,其主体构型均属反式,分别为反-β-苯硫基苯乙烯(Ⅰa),反-β-苯硫基对溴苯乙烯(Ⅱa),反-β-苯硫基对硝基苯乙烯(Ⅲa)及反-β-苯硫基丙烯酸(Ⅳa)。加成物的得率按以下顺序而递減:Ⅰa>Ⅱa>Ⅲa>Ⅳa。在低温(-45~-35°)苯硫酚与四种炔烃在溶液中反应时,除对硝基苯乙炔不起反应外,其它三种炔化合物均给出全部或绝大部分顺式构型产物(反式加成),分别为顺-β-苯硫基苯乙烯(Ⅰb,100%),顺-β-苯硫基对溴苯乙烯(Ⅱb,75%)及顺-β-苯硫基丙烯酸(Ⅳb,80%)。所有顺式构型产物在反应条件下都稳定,只是在加热到160°以上时才转化为反式构型产物。苯硫酚对炔烃的直接加成为一自由基反应,所观察到的立体化学结果被解释为加成反应中形成的中间体自由基(Ⅴ),由于R(苯基或羧基)与处于顺式位置的C_6H_5S基的空间位阻,在与苯硫酚进行链转移之前发生异构化所致。因为Ⅴ的异构化为Ⅵ需要一定的活化能,故在低温下的加成全部或绝大部分按反式加成进行,在温度升高时全部转为顺式加成。苯硫酚与对硝基苯乙炔在无水乙醚中在—60°形成一深紫色溶液,两小时后颜色逐渐变淡,这似乎表明有自由基的形成。苯硫酚与四种炔化合物在乙氧基负离子催化下进行加成时,得到全部为反式加成的产物,分别为Ⅰb,Ⅱb,顺-β-苯硫基对硝基苯乙烯(Ⅲb)及Ⅳb。

The anion radicals formed by the reaction of nickl acctylacctonatc, Trifluoroacctylacctonatc and α-thiophcnformyl trifluoro-acctonatc with Grignard rcagents have been studied by ESR spectra and the substitucnt effects have been also discussed.

本文用ESR研究了乙酰丙酮镍、三氟乙酰丙酮镍和α-噻吩甲酰三氟丙酮镍分别与五种格民试剂反应形成的中间体——自由基负离子,并讨论了这类β-二酮的不同取代基对基寿命的影响。

Fluoroalkyi iodide reacted with alkyne in the presence of oatalytic amounts of tetrakis(triphenylphosphine) palladium (0) to give a mixture of E and Z-fluoroalkylated adduct. The reaction could not be catalyzed by diohlorobis (triphenylphosphine) palladium and fluoroalkyi complex of palladium. 2-nitro-2-nitrosopropane partly suppressed the reaction. It is believed that the reaction proceeds through a free radical intermediate rather than fluoroalkyi complex of palladium.

四(三苯基膦)钯(O)在温和的条件下能催化氟烷基碘R_FI[R_F=(CF_2)_nCl,n=2;n=4;n=6;R_F=(CF_3)_nCF_3,n=3;n=1;R_F=H(CF_2)_4]对炔烃(CH≡CC_4H_9,CH≡CSiMe_3,CH≡CPh)加成生成较高产率的加成产物.二(三苯基膦)二氯化钯(II)和二(三苯基膦)氟烷基碘化钯(II)在同样的条件下无催化作用.2,2-硝基,亚硝基丙烷能部分阻止反应,这表明反应的可能中间体是自由基.而不是二(三苯基膦)氟烷基碘化钯(II).

 
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